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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It's up to you - you could connect:
5vfrom USB to Pixl.jsVinOr
3.3vfrom USB to Pixl.js3.3vPersonally I'd say do the first one - it's safer, since you're then using Pixl.js's own 3.3v regulator to get the right voltage.